linux-kernel - Re: [PATCH v2 08/25] arch: introduce memremap()

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Date:	Sun, 26 Jul 2015 19:25:27 +0200
From:	Christoph Hellwig <hch@....de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	tglx@...utronix.de, mingo@...nel.org, hpa@...or.com,
	linux-arch@...r.kernel.org, toshi.kani@...com,
	Arnd Bergmann <arnd@...db.de>, linux-nvdimm@...ts.01.org,
	linux-kernel@...r.kernel.org, rmk+kernel@....linux.org.uk,
	hch@....de, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 08/25] arch: introduce memremap()

On Fri, Jul 24, 2015 at 10:38:42PM -0400, Dan Williams wrote:
> The behavior change to return NULL on an unsupported request is reserved
> for a later patch.

Why?

> +enum {
> +	MEMREMAP_WB = 1 << 0,
> +	MEMREMAP_WT = 1 << 1,
> +	MEMREMAP_CACHE = MEMREMAP_WB,

What's the point of having this MEMREMAP_CACHE alias?

Also please document the meaning of the flags for the poor users.

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